Chusetts



(No Model.) 3 sheets-sheen 1. E. 8T, F. W. HEYMANN.

ELECTRIC ARC LAMP. No. 443,632. Patented 1360.60, 1890.

3 Sheets-Sheet 2.

(No Mder.)

E. s; P. W. HEYMANN.

ELECTRIC ARG LAMP.

Patented Dec. 30,1890.

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3 Sheets-Sheet 3.

(No Model.)

E. 8v I'. W.HEYMANN.

l ELECTRIC ARG LAMP.. No. 443,632.

Patented Deo. 30, 1890.

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UNITED STATES PATENT OFFICE.

EDlVARD llEYMANN AND FRANK XVM. HEYMANN, OF BOSTON, MASSA- CHUSETTS.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 443,632, dated December 30, 1890.

Application tiled November 5, 1888. Serial No. 290,003. (No model.)

lo @ZZ whom it may concern:

Beit known that we, EDWARD HEYMANN and FRANK WM. HEYMANN, both of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Regulator for Arc Lamps, of which the following is a specification, reference being had to the accompanying drawings, in which- Figures l and 2 are elevations of an electric lamp embodying my invention, parts being broken off in Fig. l for greater clearness. Fig. 3 is a plan of what is shown in Figs. l and 2, partly in section on lines 3 3 of Fig. l. Fig. fl is a sectional view, on line 4 4 of Fig. 3, showing a pole of the auxiliary magnet and a pole of the other magnet and also the stops hereinafter mentioned. Fig. 5 is a sectional view, on line 5 5 of Fig. 1. Fig. 6 is a view partly in section on line l5 G of Fig. l.

In all arc lamps known to us before ourin vention the feed-rod was connected by mechanical devices with the regulating-magnets, and the main object of our invention is to do away with mechanical devices between the feed-rod and its actuating-magnet; andour invention consists, mainly, in a regulator whose feed-rod is controlled by its magnet.

In that form of our invention shown in the drawings, A is the feed-rod carrying the positive carbon and so mounted as to movelengthwise in the frame. This feedrod A is in the held of the regulating-magnet and controlled by that magnet. As shown in the drawings, this magnet has a middle pole-piece d and two terminal pole-pieces d', from which it will y be clearv that the consequent pole d is opposite in polarity to the terminal poles cl', and the main windings cl2 are such as to make the terminal poles d of the same polarity. The windings cl3 are shunt-windings, and these shunt-windings cl3 oppose the main windings, as will be plain to all skilled in the art. lVhen the carbons are in contact, the poles d and C7. are at their maximum intensity, and the magnet is put in motion and carries with it the feed-rod A, that feed-rod being controlled by the pole d, and the arc is thereby established. After the arc is thus established, as will be clear to all skilled in the art, the magnet is `affected more and more by the shunt-windin gs f7.3 and less by the main windings (Z2 as the arc increases in length, for the shunt-windings cl3 oppose the main windings d2, and the magnet gradually moves back on its axis as the carbon burns away, until the back motion of magnet is arrested by the stops d'1; but as the carbon still continues to burn away the arc is still farther lengthened and the shunt-windings still oppose the main windings, the field of pole d will soon no longer have sufficient power to prevent the feed-rod A from moving past pole d, thereby shortening the arc and regulating the feed. On the other hand, as the feed-rod A moves past its pole cpl, the effect of the shunt-windings cls decreases and the effect of the main windings d2 increases, thereby preventing farther motion of the feed-rod A past pole d. If it should happen that the feed-rod moves a little too far past pole d, thereby shortening the arc unduly, the magnet will take up the feed-rod slightly; but with a very nice adjustment of the shunt and main windings the motion of the magnet can be made almost imperceptible; and in practice the 'feed of feedrod depends mainly upon the variations of the field of force of pole d, for although the magnet can on careful inspection be seen to rock slightly, yet the length of arc does notvary perceptibly after it is once established.

It will be seen that the feeds-od A and its magnet are connected not by any mechanical device, as heretofore, but directly, and this is the distinguishing characteristic of our invention.

It will be obvious that our invention may be embodied in a great variety of forms, and

in point of fact our main difficulty has been to select from the various forms which we have contemplated that one which we think on the whole preferable. For various reasons we have concluded that the regulating-mag net should be moved upon. its axis rather than in any other way and also that an auxiliary magnet is desirable for the best result-s; and we will now describe in detail that form of our invention embodying these two features.

The poles b h of the auxiliary magnet are of course opposite respectively to the poles (l cl', and hence the main windings h2 and shunt-4 wndings h3 will be understood Without further description. It will be clear that the poles b serve as armatures for the poles d and that the pole l) concentrates the Field of pole (I,

The corel) is mounted on centers, which are carried by the plates d", and these plates should be adjustable on the frame. The core B is also mounted between adjustable plates b5; but the core B is of course held stationary in order that the attraction between 'its poles ZJ and the poles fl et' corel) mag7 give motion t0 core I).

The electrical connections and other details will be understood by all skilled in the art without description.

The feed-.rod A, as will be clear7 should be of iron or other magnetic material, and, theretore, close to or in easy Contact with the pole (Z. That embodiment of our invention in which the magnet acts mechanically upon the feed-rod, therebyT enabling' that rod to be made of non-magnetic material, forms the subject.- matter of an application tiled herewith.

We are aware of Patents No. 332,173, lo

"ilson, December S, 1835, No. 219,872, to Ball, November 22,1881, No. 253,826, to Arcy, February 14, 1882, No. 335,786, te Telsa, February 9,1886, and No. 362,312, to Pieper, Fils, May 3, 1837, and disclaim allthat is shown in them.

That we claim as our invention isk In an arc-lightregnlator, a 'feed-rod ot n1agnetie material, in combination with an electromaguet having shunt and main windings, the core et' the magnet being mounted axially and extending across the feed-rod and carrying a pole-piece the magnetism of which contrels the feed-rod, and oneormore pole-pieces which act with a second magnet to move the controlling-magnet on its axis, substantially as and for the purpose set torth.

ICDXVARD IIEYMA NN. FRANK WM. HIYMANN.

Witnesses:

J. E. Miu NADIER, JouN R. SNow. 

